sometimes the asteroids spawn on the edges of the screen and make it impossible but otherwise pretty good.

Took me a little while to figure out what to do here, but eventually figured it out, and was able to get up to a score of 41.  IMO--would be nicer if the positioning was a bit more forgiving. 

I tried swapping out

x\1+3==d and y\1+2==f)

for

(x+3-d)^2+(y+2-f)^2<9)

And that feels a bit better to me, though it does use 2 extra characters, you could save them by reformatting your variable declaration to not use comma-separation for numeric values

x=61y=57w=0...  uses 11 characters, compraed to x,y,w=61,57,0 which uses 13 (since you just need the =, not two commas per variable).

With that, I was able to score in the 90s. :)

Fun game, though, and nicely done getting it in just 499 characters!